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Linux/drivers/usb/host/ohci-s3c2410.c

  1 /*
  2  * OHCI HCD (Host Controller Driver) for USB.
  3  *
  4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
  5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
  6  * (C) Copyright 2002 Hewlett-Packard Company
  7  *
  8  * USB Bus Glue for Samsung S3C2410
  9  *
 10  * Written by Christopher Hoover <ch@hpl.hp.com>
 11  * Based on fragments of previous driver by Russell King et al.
 12  *
 13  * Modified for S3C2410 from ohci-sa1111.c, ohci-omap.c and ohci-lh7a40.c
 14  *      by Ben Dooks, <ben@simtec.co.uk>
 15  *      Copyright (C) 2004 Simtec Electronics
 16  *
 17  * Thanks to basprog@mail.ru for updates to newer kernels
 18  *
 19  * This file is licenced under the GPL.
 20 */
 21 
 22 #include <linux/clk.h>
 23 #include <linux/io.h>
 24 #include <linux/kernel.h>
 25 #include <linux/module.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/platform_data/usb-ohci-s3c2410.h>
 28 #include <linux/usb.h>
 29 #include <linux/usb/hcd.h>
 30 
 31 #include "ohci.h"
 32 
 33 
 34 #define valid_port(idx) ((idx) == 1 || (idx) == 2)
 35 
 36 /* clock device associated with the hcd */
 37 
 38 
 39 #define DRIVER_DESC "OHCI S3C2410 driver"
 40 
 41 static const char hcd_name[] = "ohci-s3c2410";
 42 
 43 static struct clk *clk;
 44 static struct clk *usb_clk;
 45 
 46 static struct hc_driver __read_mostly ohci_s3c2410_hc_driver;
 47 
 48 /* forward definitions */
 49 
 50 static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc);
 51 
 52 /* conversion functions */
 53 
 54 static struct s3c2410_hcd_info *to_s3c2410_info(struct usb_hcd *hcd)
 55 {
 56         return dev_get_platdata(hcd->self.controller);
 57 }
 58 
 59 static void s3c2410_start_hc(struct platform_device *dev, struct usb_hcd *hcd)
 60 {
 61         struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
 62 
 63         dev_dbg(&dev->dev, "s3c2410_start_hc:\n");
 64 
 65         clk_prepare_enable(usb_clk);
 66         mdelay(2);                      /* let the bus clock stabilise */
 67 
 68         clk_prepare_enable(clk);
 69 
 70         if (info != NULL) {
 71                 info->hcd       = hcd;
 72                 info->report_oc = s3c2410_hcd_oc;
 73 
 74                 if (info->enable_oc != NULL)
 75                         (info->enable_oc)(info, 1);
 76         }
 77 }
 78 
 79 static void s3c2410_stop_hc(struct platform_device *dev)
 80 {
 81         struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
 82 
 83         dev_dbg(&dev->dev, "s3c2410_stop_hc:\n");
 84 
 85         if (info != NULL) {
 86                 info->report_oc = NULL;
 87                 info->hcd       = NULL;
 88 
 89                 if (info->enable_oc != NULL)
 90                         (info->enable_oc)(info, 0);
 91         }
 92 
 93         clk_disable_unprepare(clk);
 94         clk_disable_unprepare(usb_clk);
 95 }
 96 
 97 /* ohci_s3c2410_hub_status_data
 98  *
 99  * update the status data from the hub with anything that
100  * has been detected by our system
101 */
102 
103 static int
104 ohci_s3c2410_hub_status_data(struct usb_hcd *hcd, char *buf)
105 {
106         struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
107         struct s3c2410_hcd_port *port;
108         int orig;
109         int portno;
110 
111         orig = ohci_hub_status_data(hcd, buf);
112 
113         if (info == NULL)
114                 return orig;
115 
116         port = &info->port[0];
117 
118         /* mark any changed port as changed */
119 
120         for (portno = 0; portno < 2; port++, portno++) {
121                 if (port->oc_changed == 1 &&
122                     port->flags & S3C_HCDFLG_USED) {
123                         dev_dbg(hcd->self.controller,
124                                 "oc change on port %d\n", portno);
125 
126                         if (orig < 1)
127                                 orig = 1;
128 
129                         buf[0] |= 1<<(portno+1);
130                 }
131         }
132 
133         return orig;
134 }
135 
136 /* s3c2410_usb_set_power
137  *
138  * configure the power on a port, by calling the platform device
139  * routine registered with the platform device
140 */
141 
142 static void s3c2410_usb_set_power(struct s3c2410_hcd_info *info,
143                                   int port, int to)
144 {
145         if (info == NULL)
146                 return;
147 
148         if (info->power_control != NULL) {
149                 info->port[port-1].power = to;
150                 (info->power_control)(port-1, to);
151         }
152 }
153 
154 /* ohci_s3c2410_hub_control
155  *
156  * look at control requests to the hub, and see if we need
157  * to take any action or over-ride the results from the
158  * request.
159 */
160 
161 static int ohci_s3c2410_hub_control(
162         struct usb_hcd  *hcd,
163         u16             typeReq,
164         u16             wValue,
165         u16             wIndex,
166         char            *buf,
167         u16             wLength)
168 {
169         struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
170         struct usb_hub_descriptor *desc;
171         int ret = -EINVAL;
172         u32 *data = (u32 *)buf;
173 
174         dev_dbg(hcd->self.controller,
175                 "s3c2410_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
176                 hcd, typeReq, wValue, wIndex, buf, wLength);
177 
178         /* if we are only an humble host without any special capabilities
179          * process the request straight away and exit */
180 
181         if (info == NULL) {
182                 ret = ohci_hub_control(hcd, typeReq, wValue,
183                                        wIndex, buf, wLength);
184                 goto out;
185         }
186 
187         /* check the request to see if it needs handling */
188 
189         switch (typeReq) {
190         case SetPortFeature:
191                 if (wValue == USB_PORT_FEAT_POWER) {
192                         dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
193                         s3c2410_usb_set_power(info, wIndex, 1);
194                         goto out;
195                 }
196                 break;
197 
198         case ClearPortFeature:
199                 switch (wValue) {
200                 case USB_PORT_FEAT_C_OVER_CURRENT:
201                         dev_dbg(hcd->self.controller,
202                                 "ClearPortFeature: C_OVER_CURRENT\n");
203 
204                         if (valid_port(wIndex)) {
205                                 info->port[wIndex-1].oc_changed = 0;
206                                 info->port[wIndex-1].oc_status = 0;
207                         }
208 
209                         goto out;
210 
211                 case USB_PORT_FEAT_OVER_CURRENT:
212                         dev_dbg(hcd->self.controller,
213                                 "ClearPortFeature: OVER_CURRENT\n");
214 
215                         if (valid_port(wIndex))
216                                 info->port[wIndex-1].oc_status = 0;
217 
218                         goto out;
219 
220                 case USB_PORT_FEAT_POWER:
221                         dev_dbg(hcd->self.controller,
222                                 "ClearPortFeature: POWER\n");
223 
224                         if (valid_port(wIndex)) {
225                                 s3c2410_usb_set_power(info, wIndex, 0);
226                                 return 0;
227                         }
228                 }
229                 break;
230         }
231 
232         ret = ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
233         if (ret)
234                 goto out;
235 
236         switch (typeReq) {
237         case GetHubDescriptor:
238 
239                 /* update the hub's descriptor */
240 
241                 desc = (struct usb_hub_descriptor *)buf;
242 
243                 if (info->power_control == NULL)
244                         return ret;
245 
246                 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
247                         desc->wHubCharacteristics);
248 
249                 /* remove the old configurations for power-switching, and
250                  * over-current protection, and insert our new configuration
251                  */
252 
253                 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
254                 desc->wHubCharacteristics |= cpu_to_le16(
255                         HUB_CHAR_INDV_PORT_LPSM);
256 
257                 if (info->enable_oc) {
258                         desc->wHubCharacteristics &= ~cpu_to_le16(
259                                 HUB_CHAR_OCPM);
260                         desc->wHubCharacteristics |=  cpu_to_le16(
261                                 HUB_CHAR_INDV_PORT_OCPM);
262                 }
263 
264                 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
265                         desc->wHubCharacteristics);
266 
267                 return ret;
268 
269         case GetPortStatus:
270                 /* check port status */
271 
272                 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
273 
274                 if (valid_port(wIndex)) {
275                         if (info->port[wIndex-1].oc_changed)
276                                 *data |= cpu_to_le32(RH_PS_OCIC);
277 
278                         if (info->port[wIndex-1].oc_status)
279                                 *data |= cpu_to_le32(RH_PS_POCI);
280                 }
281         }
282 
283  out:
284         return ret;
285 }
286 
287 /* s3c2410_hcd_oc
288  *
289  * handle an over-current report
290 */
291 
292 static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc)
293 {
294         struct s3c2410_hcd_port *port;
295         struct usb_hcd *hcd;
296         unsigned long flags;
297         int portno;
298 
299         if (info == NULL)
300                 return;
301 
302         port = &info->port[0];
303         hcd = info->hcd;
304 
305         local_irq_save(flags);
306 
307         for (portno = 0; portno < 2; port++, portno++) {
308                 if (port_oc & (1<<portno) &&
309                     port->flags & S3C_HCDFLG_USED) {
310                         port->oc_status = 1;
311                         port->oc_changed = 1;
312 
313                         /* ok, once over-current is detected,
314                            the port needs to be powered down */
315                         s3c2410_usb_set_power(info, portno+1, 0);
316                 }
317         }
318 
319         local_irq_restore(flags);
320 }
321 
322 /* may be called without controller electrically present */
323 /* may be called with controller, bus, and devices active */
324 
325 /*
326  * ohci_hcd_s3c2410_remove - shutdown processing for HCD
327  * @dev: USB Host Controller being removed
328  * Context: !in_interrupt()
329  *
330  * Reverses the effect of ohci_hcd_3c2410_probe(), first invoking
331  * the HCD's stop() method.  It is always called from a thread
332  * context, normally "rmmod", "apmd", or something similar.
333  *
334 */
335 
336 static int
337 ohci_hcd_s3c2410_remove(struct platform_device *dev)
338 {
339         struct usb_hcd *hcd = platform_get_drvdata(dev);
340 
341         usb_remove_hcd(hcd);
342         s3c2410_stop_hc(dev);
343         usb_put_hcd(hcd);
344         return 0;
345 }
346 
347 /**
348  * ohci_hcd_s3c2410_probe - initialize S3C2410-based HCDs
349  * Context: !in_interrupt()
350  *
351  * Allocates basic resources for this USB host controller, and
352  * then invokes the start() method for the HCD associated with it
353  * through the hotplug entry's driver_data.
354  *
355  */
356 static int ohci_hcd_s3c2410_probe(struct platform_device *dev)
357 {
358         struct usb_hcd *hcd = NULL;
359         struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
360         int retval;
361 
362         s3c2410_usb_set_power(info, 1, 1);
363         s3c2410_usb_set_power(info, 2, 1);
364 
365         hcd = usb_create_hcd(&ohci_s3c2410_hc_driver, &dev->dev, "s3c24xx");
366         if (hcd == NULL)
367                 return -ENOMEM;
368 
369         hcd->rsrc_start = dev->resource[0].start;
370         hcd->rsrc_len   = resource_size(&dev->resource[0]);
371 
372         hcd->regs = devm_ioremap_resource(&dev->dev, &dev->resource[0]);
373         if (IS_ERR(hcd->regs)) {
374                 retval = PTR_ERR(hcd->regs);
375                 goto err_put;
376         }
377 
378         clk = devm_clk_get(&dev->dev, "usb-host");
379         if (IS_ERR(clk)) {
380                 dev_err(&dev->dev, "cannot get usb-host clock\n");
381                 retval = PTR_ERR(clk);
382                 goto err_put;
383         }
384 
385         usb_clk = devm_clk_get(&dev->dev, "usb-bus-host");
386         if (IS_ERR(usb_clk)) {
387                 dev_err(&dev->dev, "cannot get usb-bus-host clock\n");
388                 retval = PTR_ERR(usb_clk);
389                 goto err_put;
390         }
391 
392         s3c2410_start_hc(dev, hcd);
393 
394         retval = usb_add_hcd(hcd, dev->resource[1].start, 0);
395         if (retval != 0)
396                 goto err_ioremap;
397 
398         device_wakeup_enable(hcd->self.controller);
399         return 0;
400 
401  err_ioremap:
402         s3c2410_stop_hc(dev);
403 
404  err_put:
405         usb_put_hcd(hcd);
406         return retval;
407 }
408 
409 /*-------------------------------------------------------------------------*/
410 
411 #ifdef CONFIG_PM
412 static int ohci_hcd_s3c2410_drv_suspend(struct device *dev)
413 {
414         struct usb_hcd *hcd = dev_get_drvdata(dev);
415         struct platform_device *pdev = to_platform_device(dev);
416         bool do_wakeup = device_may_wakeup(dev);
417         int rc = 0;
418 
419         rc = ohci_suspend(hcd, do_wakeup);
420         if (rc)
421                 return rc;
422 
423         s3c2410_stop_hc(pdev);
424 
425         return rc;
426 }
427 
428 static int ohci_hcd_s3c2410_drv_resume(struct device *dev)
429 {
430         struct usb_hcd *hcd = dev_get_drvdata(dev);
431         struct platform_device *pdev = to_platform_device(dev);
432 
433         s3c2410_start_hc(pdev, hcd);
434 
435         ohci_resume(hcd, false);
436 
437         return 0;
438 }
439 #else
440 #define ohci_hcd_s3c2410_drv_suspend    NULL
441 #define ohci_hcd_s3c2410_drv_resume     NULL
442 #endif
443 
444 static const struct dev_pm_ops ohci_hcd_s3c2410_pm_ops = {
445         .suspend        = ohci_hcd_s3c2410_drv_suspend,
446         .resume         = ohci_hcd_s3c2410_drv_resume,
447 };
448 
449 static const struct of_device_id ohci_hcd_s3c2410_dt_ids[] = {
450         { .compatible = "samsung,s3c2410-ohci" },
451         { /* sentinel */ }
452 };
453 
454 MODULE_DEVICE_TABLE(of, ohci_hcd_s3c2410_dt_ids);
455 
456 static struct platform_driver ohci_hcd_s3c2410_driver = {
457         .probe          = ohci_hcd_s3c2410_probe,
458         .remove         = ohci_hcd_s3c2410_remove,
459         .shutdown       = usb_hcd_platform_shutdown,
460         .driver         = {
461                 .name   = "s3c2410-ohci",
462                 .pm     = &ohci_hcd_s3c2410_pm_ops,
463                 .of_match_table = ohci_hcd_s3c2410_dt_ids,
464         },
465 };
466 
467 static int __init ohci_s3c2410_init(void)
468 {
469         if (usb_disabled())
470                 return -ENODEV;
471 
472         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
473         ohci_init_driver(&ohci_s3c2410_hc_driver, NULL);
474 
475         /*
476          * The Samsung HW has some unusual quirks, which require
477          * Sumsung-specific workarounds. We override certain hc_driver
478          * functions here to achieve that. We explicitly do not enhance
479          * ohci_driver_overrides to allow this more easily, since this
480          * is an unusual case, and we don't want to encourage others to
481          * override these functions by making it too easy.
482          */
483 
484         ohci_s3c2410_hc_driver.hub_status_data  = ohci_s3c2410_hub_status_data;
485         ohci_s3c2410_hc_driver.hub_control      = ohci_s3c2410_hub_control;
486 
487         return platform_driver_register(&ohci_hcd_s3c2410_driver);
488 }
489 module_init(ohci_s3c2410_init);
490 
491 static void __exit ohci_s3c2410_cleanup(void)
492 {
493         platform_driver_unregister(&ohci_hcd_s3c2410_driver);
494 }
495 module_exit(ohci_s3c2410_cleanup);
496 
497 MODULE_DESCRIPTION(DRIVER_DESC);
498 MODULE_LICENSE("GPL");
499 MODULE_ALIAS("platform:s3c2410-ohci");
500 

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